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Gevrey hypoellipticity for a class of operators with multiple characteristics. (English) Zbl 0501.35021

Astérisque 89-90, 249-261 (1981).
For the entire collection see [Zbl 0481.00013].

MSC:

35H10 Hypoelliptic equations
35S05 Pseudodifferential operators as generalizations of partial differential operators
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